I was having radiator leak and put Stop leak in that. After some days my car started to overheat. I replaced radiator,thermostat and water pump but problem remains same. I saw my water pump was clogged with stop leak and it might have clogged other circulations also. Please find following solution and confirm if this works for Stop leak clogging also. Join 2 lines to make link..
http://www.geocities.
com/b_gillie/TSB990602012.htm